CN104330966A - Multi-mode high-precision time and frequency standard equipment - Google Patents
Multi-mode high-precision time and frequency standard equipment Download PDFInfo
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- CN104330966A CN104330966A CN201410564978.0A CN201410564978A CN104330966A CN 104330966 A CN104330966 A CN 104330966A CN 201410564978 A CN201410564978 A CN 201410564978A CN 104330966 A CN104330966 A CN 104330966A
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- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
Abstract
The invention relates to multi-mode high-precision time and frequency standard equipment. N input ports of a multi-mode information fusion module of the equipment are connected with N time-service-type satellite receivers respectively. A multiphase phase-locked loop frequency control module comprises a multiphase phase-locked loop, a multiphase counter and a loop filter. A high-stability crystal oscillator is connected with the frequency input end of the multiphase phase-locked loop; M clock signals generated by the multiphase phase-locked loop are transmitted to the multiphase counter, and M count values are obtained after counting; then, counting errors are obtained; control quantity is obtained after the counting errors are subjected to the loop filter; and a high-precision digital analog converter converts the control quantity into voltage signals to control the frequency of the high-stability crystal oscillator. A second pulse generation module regenerates second pulses based on second pulses obtained after the correction of the multi-mode information fusion module and frequency signals of the high-stability crystal oscillator. A UTC output coding module carries out different coding and protocol processing on UTC information from the multi-mode information fusion module. The equipment is high in accuracy.
Description
(1), technical field: the present invention relates to a kind of time, frequency standard equipment, particularly relate to one
Multimode split-second precision, frequency standard equipment.
(2), background technology: accurate Time Service has a wide range of applications in fields such as national defence, communication, electric power, fundamental researchs demand, the common Time Service based on crystal clock oneself can not meet high-end requirement, need the Time Service System adapted with its demand for some specific user design.Split-second precision, frequency standard equipment can provide high-precision markers and frequency standard signal, and it is the indispensable shoring of foundation equipment of the electronic equipments such as a lot of communication, signal transacting.Such as, high-speed digital communication is more and more higher to the requirement that net is synchronous, and oneself reaches nanosecond; The occasion that the transmitting, early warning, radar network composite detection, robotization commander etc. of strategic missile are related to national security needs high precision and stable time unification service.
The continuity of present stage the most widely used GPS time dissemination system, availability and anti-interference still seem weaker for some important events, be in particular in: the time signal long-time stability that (1) GPS exports are good, and short-term stability is poor; (2) interference free performance of GPS is poor, may cause gps clock saltus step in the occasion of electromagnetism situation more complicated.What is more important GPS availability and time service precision are limited by the GPS policy of the U.S., and the U.S. can close at particular time or disturb the gps signal in some region, to reduce or to stop navigator fix, the time service service in this region.In order to break away from navigation, time service field to the dependence of gps system, China establishes oneself " Big Dipper " satellite navigation system.Along with the structure of " No. two, the Big Dipper " system is day by day perfect, particularly the GEO satellite of this system has the feature of Doppler little ﹑ frequency stabilization, and this system is suitable as time, frequency source signal very much.
Present stage, main time service method comprised three kinds:
(1) shortwave time service; Its time service precision only has ± about lms, requires that higher occasion cannot meet use at some time service precisions.
(2) long-wave time service; The time service precision of domestic long-wave time service platform can reach+5 μ s.But long-wave time service also exist time service information single, can not autonomous many limitations such as time service.Meanwhile, if when the time service chain of stations Data duplication cycle is longer, user will could time service success through for a long time. be unfavorable for accurately measuring and real-time time service.
(3) satellite-based time service mode; Mainly adopt navigation positioning system such as GPS to carry out time service, its precision can reach 50ns; The time service time is generally less than 5 minutes.
It is high that satellite-based time service mode based on navigation positioning system has precision, the feature that time service is fast, is present stage to adopt time service mode the most widely.
There are the more time service module based on GPS and system both at home and abroad.If Changchun Institute of Optics, Fine Mechanics and Physics, CAS is based on the LEA-5T Design and implementation quick high accuracy time dissemination system of Μ-blox, when normal receiving satellite signal, time service precision can reach 30ns.Can in inclement weather (only seeing a star) situation output time signal; Actual measurement synchronizing signal precision is 600ns.Along with the development of dipper system, some units of China and company start the time service equipment researched and developed based on GPS and dipper system, study as No.706 Inst, No.2 Academy, China Astronautic Sci Ind Group and devise a kind of time service positioning equipment, this equipment not only possesses the various functional characteristics of the Big Dipper, gps satellite navigational system mobile terminal, and the auxiliary time service function such as when combining B code, outer school, in addition, high precision is also achieved from punctual function.In hardware design, adopt embedded-type ARM architecture to carry out economical design, taken into full account reliability and capability of maintenance design simultaneously.When the Big Dipper or gps antenna are erected at accurate open ground, after device power-on starts, the cold time service time is not more than 3min, and after warm start, the time service time is not more than 2min.Under similarity condition, after device power-on cold start-up, the auxiliary positioning time is not more than 4min, and time synchronization error is not more than 400ns, and punctual precision is about the error of 24 hours 1ms.The HJ5435-BD GPS synchronous clock of Beijing Tai Fute Electronic Science and Technology Co., Ltd. research and development, the frequency stability of output is 5 ╳ 10
-12/ s; When normal reception, the error of 1pps is less than 30ns; But this product can not ensure timekeeping performance.
The principal feature of these existing equipment is as follows:
(1) just the 1pps of various modes carried out preferably and supplement, not carrying out real Data Fusion, improve not obvious to the performance of whole system.
(2) inadequate to the control accuracy of frequency, generally can only reach the maximum clock speed of processor, so time and frequency accuracy are not high, also cause its punctual precision not high simultaneously.
(3), summary of the invention:
The technical problem to be solved in the present invention is: provide the much higher mould split-second precision of a kind of accuracy, frequency standard equipment.
Technical scheme of the present invention: a kind of multimode split-second precision, frequency standard equipment, containing N number of time service type satellite receiver, high stability crystal oscillator, high precision digital-to-analog converter, multimodal information Rong matched moulds Kuai ﹑ leggy phase-locked loop frequency Kong molding Kuai ﹑ pulse per second (PPS) generation module and UTC output encoder module, N is that 1 or 2 or 3, multimodal information Rong matched moulds Kuai ﹑ leggy phase-locked loop frequency Kong molding Kuai ﹑ pulse per second (PPS) generation modules and UTC output encoder module all adopt FPGA to realize; The major function of this equipment produces high-precision time and frequency signal, and output time signal is UTC time and 1pps mainly, and frequency signal is 10MHz clock signal mainly;
The main characteristic of of multimodal information Fusion Module is exactly the time service information having merged multiple satellite navigation and location system, and traditional multimode manner is all based on preferred mode, namely in multiple 1pps source preferably one as with reference to source.Multimodal information Fusion Module adopts syncretizing mechanism the information of various modes to be merged, to improve the overall performance of system.N number of input port of multimodal information Fusion Module is connected with the serial ports of N number of time service type satellite receiver respectively, containing pulse per second (PPS) phase correction unit and UTC time Extraction parts in multimodal information Fusion Module, pulse per second (PPS) phase correction unit judges whether the pulse per second (PPS) (1pps) that time service type satellite receiver produces can be used, and carries out fusion treatment to available pulse per second (PPS); UTC time Extraction parts was compared to the UTC time from multiple time service type satellite receiver, to ensure the correctness of UTC time, and comprehensive and comparison are carried out to the leap second information from multiple time service type satellite receiver, to ensure to carry out leap second process timely;
Leggy phase-locked loop frequency control module contains leggy phaselocked loop, leggy counter and loop filter, and it adopts the mode of leggy phaselocked loop to improve the precision of high stability crystal oscillator frequency, the frequency output terminal of high stability crystal oscillator is connected with the frequency input of leggy phaselocked loop, leggy phaselocked loop carries out frequency multiplication to the 10MHz frequency signal that high stability crystal oscillator produces, and produce same frequency, M clock signal of out of phase is to leggy counter, leggy counter utilizes this M clock signal to count the pulse per second (PPS) (1pps) after the correction of pulse per second (PPS) phase correction unit respectively, obtain M count value, this M count value is averaged, obtain a weighted mean value, and this weighted mean value is compared as actual count value and theoretical count value, obtain counting error, as: to incoming frequency 20 frequency multiplication of the 10MHz 200MHz clock to 4 phase places, due to the inaccuracy of the frequency that crystal oscillator produces, the count value of 4 clocks to the 1pps of input is 200000010,200000011,200000011,200000011 respectively, so averaged count is 200000010.75, and desirable count value is 200000000, so counting error value is exactly 10.75, counting error obtains the voltage-controlled value for controlling high stability crystal oscillator frequency after loop filter, send to high precision digital-to-analog converter after this voltage-controlled value is converted to corresponding controlled quentity controlled variable, high precision digital-to-analog converter controls the frequency of high stability crystal oscillator after this controlled quentity controlled variable is converted to voltage signal, through repeatedly adjusting, the frequency error of high stability crystal oscillator can reach requirement gradually, and the process of its adjustment is dynamically carried out in real time,
The sample same frequency clock of multiple phase place of leggy phase-locked loop frequency control module counts 1pps simultaneously, this counting mode is equivalent to the frequency that improve counting, multi-phase clock as 4 200MHz counts, the clock being equivalent to a 800MHz is counting, this mode greatly increases the precision of counting, correspondingly also improves the control accuracy of crystal oscillator;
The frequency signal that the accuracy that pulse per second (PPS) (1pps) after pulse per second (PPS) generation module corrects based on pulse per second (PPS) phase correction unit and high stability crystal oscillator produce is high, regenerates the pulse per second (PPS) (1pps) of high precision and high stability; The pulse per second (PPS) (1pps) exported when time service type satellite receiver is available and after carrying out multimode correction, phase potential source based on this 1pps, using high precision frequency as 1pps gap count source, produce new 1pps, this 1pps have phase place accurately, interval feature accurately;
In the normal situation of time service type satellite receiver, the phase place of 1pps comparatively accurately can be obtained after its work a period of time, by the control errors of high stability crystal oscillator a less scope, after namely crystal oscillator has been tamed, this multimode split-second precision, frequency standard equipment inform can keep time in outside; In this case, if the signal of all time service type satellite receiver is blocked or disturbs, its 1pps is down state, pulse per second (PPS) generation module enters punctual pattern, carry out the generation of 1pps with the phase place of existing 1pps and frequency, and inform outside, current employing be punctual pattern.
UTC output encoder module carries out different codings and protocol processes to the UTC information from UTC time Extraction parts, to adapt to different external interfaces.
Time service type satellite receiver contains GPS time service type receiver, Big Dipper generation time service type receiver and Beidou II time service type receiver.It is good that the 1pps that GPS time service type receiver, Big Dipper generation time service type receiver and Beidou II time service type receiver produce has long steady characteristic, the feature of short steady characteristic difference.The error that short steady characteristic refers to each 1pps is comparatively large, maximumly reaches 100ns; Long steady characteristic refers to that cumulative errors is very little, at the normal satellite-signal receiving abundant (more than four), would not have cumulative errors.And high stability crystal oscillator to have long steady characteristic poor, the feature that short steady characteristic is good.The short steady characteristic of two calibration cell crystal oscillator can reach 1.0E-10/s, but error can be accumulated along with the increase of time, and the cumulative errors of a day can reach 100 μ s levels.The steady characteristic of length of the time signal that this equipment mainly utilizes navigation neceiver to produce and the short steady characteristic of high stability crystal oscillator produce high-precision time, frequency standard.
Pulse per second (PPS) phase correction unit judge pulse per second (PPS) that time service type satellite receiver produces whether can method be: pulse per second (PPS) phase correction unit receives the information based on NMEA agreement from time service type satellite receiver, judge whether time service type satellite receiver has received enough satellite-signals and completed location and timing working by this information, if time service type satellite receiver has completed location and timing working, and be less than 5 for locating with the GDOP of the satellite of timing, then think that pulse per second (PPS) can be used, otherwise think that pulse per second (PPS) is unavailable;
The method of available pulse per second (PPS) being carried out to fusion treatment is: first carry out balancing filter process to the pps pulse per second signal of each time service type satellite receiver, to reduce stochastic error, then least-squares algorithm is adopted to carry out adjustment optimization to the pulse per second (PPS) from multiple module, to obtain phase place pps pulse per second signal more accurately, as the basis of subsequent treatment.
Different coding in UTC output encoder module is containing the IRIG-B serial code and the NMEA serial code that meet time calibration in network standard Network Time Protocol.
Beneficial effect of the present invention:
1, the signal of the satellite navigation system of various modes has been merged in the present invention, adopts rational blending algorithm to obtain than single system better time, frequency performance; Adopt multiple same phase shifting frequencies signal frequently to carry out taming of crystal oscillator, improve the control accuracy to crystal oscillator; Provide good punctual time frequency signal, cannot normally when receiving satellite signal, using the high 1pps phase place of accuracy as start-phase, using the clock of high precision and high stability as frequency source, produce pulse per second (PPS) (1pps) and the time signal of recursion, to adapt to the situation of dropout in the short period; Provide multiple time issuing interface, meet multiple applications interface.The present invention can provide accurately national defence and national economy field, continuous print Time Service, has broad application prospects, and also contributes to the autonomous application power improving China's dipper system.
2, the present invention makes full use of GPS and dipper system advantage separately, merge the long steady characteristic of time-frequency target of two kinds of systems, utilize the short steady characteristic of high stability crystal oscillator, adopt high speed fpga chip, high precision DA chip and time-frequency control algolithm, obtain time, the frequency standard with the steady characteristic of good length and short steady characteristic.
3, traditional multimode manner is all based on preferred mode, namely a preferred reference source the most in multiple 1pps source; The present invention adopts syncretizing mechanism and algorithm the information of various modes to be merged, to improve the overall performance of system, first judge that whether the 1pps that each satellite navigation time service module produces is effective, and judge its degree of confidence according to the GDOP value of location, provide its weights, the 1pps then adopting the weighted least square algorithm of mature and reliable to produce multiple source is smoothing, to obtain the higher 1pps signal of accuracy, therefore, algorithm complex of the present invention is lower.
4, leggy phase-locked loop frequency control module of the present invention can improve the performance of whole equipment largely, and the same phaselocked loop of high speed FPGA can produce and reach 6 with frequency displacement phase frequency, and its phase deviation is very little, realizes difficulty less; The frequency-locked loop being used for controlling external crystal-controlled oscillation is a first-order loop, and the difficulty of its realization and debugging is also less.
(4), accompanying drawing illustrates:
Fig. 1 is the structured flowchart of multimode split-second precision, frequency standard equipment;
Fig. 2 is the structured flowchart of multimodal information Fusion Module;
Fig. 3 is the structured flowchart of leggy phase-locked loop frequency control module;
Fig. 4 is the same frequency multi-phase clock signal schematic diagram that leggy phaselocked loop produces;
Fig. 5 is the structured flowchart of pulse per second (PPS) generation module.
(5), embodiment:
Multimode split-second precision, frequency standard equipment (as shown in Figure 1) are containing 3 time service type satellite receiver, high stability crystal oscillator, high precision digital-to-analog converter, multimodal information Rong matched moulds Kuai ﹑ leggy phase-locked loop frequency Kong molding Kuai ﹑ pulse per second (PPS) generation module and UTC output encoder module, and multimodal information Rong matched moulds Kuai ﹑ leggy phase-locked loop frequency Kong molding Kuai ﹑ pulse per second (PPS) generation module and UTC output encoder module all adopt FPGA to realize; The major function of this equipment produces high-precision time and frequency signal, and output time signal is UTC time and 1pps mainly, and frequency signal is 10MHz clock signal mainly;
The main characteristic of of multimodal information Fusion Module (as shown in Figure 2) is exactly the time service information having merged multiple satellite navigation and location system, and traditional multimode manner is all based on preferred mode, namely in multiple 1pps source preferably one as with reference to source.Multimodal information Fusion Module adopts syncretizing mechanism the information of various modes to be merged, to improve the overall performance of system.3 input ports of multimodal information Fusion Module are connected with the serial ports of 3 time service type satellite receiver respectively, containing pulse per second (PPS) phase correction unit and UTC time Extraction parts in multimodal information Fusion Module, pulse per second (PPS) phase correction unit judges whether the pulse per second (PPS) (1pps) that time service type satellite receiver produces can be used, and carries out fusion treatment to available pulse per second (PPS); UTC time Extraction parts was compared to the UTC time from multiple time service type satellite receiver, to ensure the correctness of UTC time, and comprehensive and comparison are carried out to the leap second information from multiple time service type satellite receiver, to ensure to carry out leap second process timely;
Leggy phase-locked loop frequency control module (as shown in Figure 3) is containing leggy phaselocked loop, leggy counter and loop filter, and it adopts the mode of leggy phaselocked loop to improve the precision of high stability crystal oscillator frequency, the frequency output terminal of high stability crystal oscillator is connected with the frequency input of leggy phaselocked loop, leggy phaselocked loop carries out frequency multiplication to the 10MHz frequency signal that high stability crystal oscillator produces, and produce same frequency, 4 clock signals (as shown in Figure 4) of out of phase are to leggy counter, leggy counter utilizes these 4 clock signals to count the pulse per second (PPS) (1pps) after the correction of pulse per second (PPS) phase correction unit respectively, obtain 4 count values, these 4 count values are averaged, obtain a weighted mean value, and this weighted mean value is compared as actual count value and theoretical count value, obtain counting error, as: to incoming frequency 20 frequency multiplication of the 10MHz 200MHz clock to 4 phase places, due to the inaccuracy of the frequency that crystal oscillator produces, the count value of 4 clocks to the 1pps of input is 200000010,200000011,200000011,200000011 respectively, so averaged count is 200000010.75, and desirable count value is 200000000, so counting error value is exactly 10.75, counting error obtains the voltage-controlled value for controlling high stability crystal oscillator frequency after loop filter, send to high precision digital-to-analog converter after this voltage-controlled value is converted to corresponding controlled quentity controlled variable, high precision digital-to-analog converter controls the frequency of high stability crystal oscillator after this controlled quentity controlled variable is converted to voltage signal, through repeatedly adjusting, the frequency error of high stability crystal oscillator can reach requirement gradually, and the process of its adjustment is dynamically carried out in real time,
The sample same frequency clock of multiple phase place of leggy phase-locked loop frequency control module counts 1pps simultaneously, this counting mode is equivalent to the frequency that improve counting, multi-phase clock as 4 200MHz counts, the clock being equivalent to a 800MHz is counting, this mode greatly increases the precision of counting, correspondingly also improves the control accuracy of crystal oscillator;
The frequency signal that the accuracy that pulse per second (PPS) (1pps) after pulse per second (PPS) generation module (as shown in Figure 5) corrects based on pulse per second (PPS) phase correction unit and high stability crystal oscillator produce is high, regenerates the pulse per second (PPS) (1pps) of high precision and high stability; The pulse per second (PPS) (1pps) exported when time service type satellite receiver is available and after carrying out multimode correction, phase potential source based on this 1pps, using high precision frequency as 1pps gap count source, produce new 1pps, this 1pps have phase place accurately, interval feature accurately;
In the normal situation of time service type satellite receiver, the phase place of 1pps comparatively accurately can be obtained after its work a period of time, by the control errors of high stability crystal oscillator a less scope, after namely crystal oscillator has been tamed, this multimode split-second precision, frequency standard equipment inform can keep time in outside; In this case, if the signal of all time service type satellite receiver is blocked or disturbs, its 1pps is down state, pulse per second (PPS) generation module enters punctual pattern, carry out the generation of 1pps with the phase place of existing 1pps and frequency, and inform outside, current employing be punctual pattern.
UTC output encoder module carries out different codings and protocol processes to the UTC information from UTC time Extraction parts, to adapt to different external interfaces.
3 time service type satellite receiver are respectively GPS time service type receiver, Big Dipper generation time service type receiver and Beidou II time service type receiver.It is good that the 1pps that GPS time service type receiver, Big Dipper generation time service type receiver and Beidou II time service type receiver produce has long steady characteristic, the feature of short steady characteristic difference.The error that short steady characteristic refers to each 1pps is comparatively large, maximumly reaches 100ns; Long steady characteristic refers to that cumulative errors is very little, at the normal satellite-signal receiving abundant (more than four), would not have cumulative errors.And high stability crystal oscillator to have long steady characteristic poor, the feature that short steady characteristic is good.The short steady characteristic of two calibration cell crystal oscillator can reach 1.0E-10/s, but error can be accumulated along with the increase of time, and the cumulative errors of a day can reach 100 μ s levels.The steady characteristic of length of the time signal that this equipment mainly utilizes navigation neceiver to produce and the short steady characteristic of high stability crystal oscillator produce high-precision time, frequency standard.
Pulse per second (PPS) phase correction unit judge pulse per second (PPS) that time service type satellite receiver produces whether can method be: pulse per second (PPS) phase correction unit receives the information based on NMEA agreement from time service type satellite receiver, judge whether time service type satellite receiver has received enough satellite-signals and completed location and timing working by this information, if time service type satellite receiver has completed location and timing working, and be less than 5 for locating with the GDOP of the satellite of timing, then think that pulse per second (PPS) can be used, otherwise think that pulse per second (PPS) is unavailable;
The method of available pulse per second (PPS) being carried out to fusion treatment is: first carry out balancing filter process to the pps pulse per second signal of each time service type satellite receiver, to reduce stochastic error, then least-squares algorithm is adopted to carry out adjustment optimization to the pulse per second (PPS) from multiple module, to obtain phase place pps pulse per second signal more accurately, as the basis of subsequent treatment.
Different coding in UTC output encoder module is containing the IRIG-B serial code and the NMEA serial code that meet time calibration in network standard Network Time Protocol.
Claims (4)
1. a multimode split-second precision, frequency standard equipment, it is characterized in that: containing N number of time service type satellite receiver, high stability crystal oscillator, high precision digital-to-analog converter, multimodal information Rong matched moulds Kuai ﹑ leggy phase-locked loop frequency Kong molding Kuai ﹑ pulse per second (PPS) generation module and UTC output encoder module, N is 1 or 2 or 3; Multimodal information Rong matched moulds Kuai ﹑ leggy phase-locked loop frequency Kong molding Kuai ﹑ pulse per second (PPS) generation module and UTC output encoder module all adopt FPGA to realize;
N number of input port of multimodal information Fusion Module is connected with the serial ports of N number of time service type satellite receiver respectively, containing pulse per second (PPS) phase correction unit and UTC time Extraction parts in multimodal information Fusion Module, pulse per second (PPS) phase correction unit judges whether the pulse per second (PPS) that time service type satellite receiver produces can be used, and carries out fusion treatment to available pulse per second (PPS); UTC time Extraction parts was compared to the UTC time from multiple time service type satellite receiver, to ensure the correctness of UTC time, and comprehensive and comparison are carried out to the leap second information from multiple time service type satellite receiver, to ensure to carry out leap second process timely;
Leggy phase-locked loop frequency control module contains leggy phaselocked loop, leggy counter and loop filter, the frequency output terminal of high stability crystal oscillator is connected with the frequency input of leggy phaselocked loop, leggy phaselocked loop carries out frequency multiplication to the frequency signal that high stability crystal oscillator produces, and produce same frequency, M clock signal of out of phase is to leggy counter, leggy counter utilizes this M clock signal to count the pulse per second (PPS) after the correction of pulse per second (PPS) phase correction unit respectively, obtain M count value, this M count value is averaged, obtain a weighted mean value, and this weighted mean value is compared as actual count value and theoretical count value, obtain counting error, counting error obtains voltage-controlled value after loop filter, sends to high precision digital-to-analog converter after this voltage-controlled value is converted to corresponding controlled quentity controlled variable, and high precision digital-to-analog converter controls the frequency of high stability crystal oscillator after this controlled quentity controlled variable is converted to voltage signal,
The frequency signal that pulse per second (PPS) after pulse per second (PPS) generation module corrects based on pulse per second (PPS) phase correction unit and high stability crystal oscillator produce, regenerates pulse per second (PPS);
UTC output encoder module carries out different codings and protocol processes to the UTC information from UTC time Extraction parts, to adapt to different external interfaces.
2. multimode split-second precision according to claim 1, frequency standard equipment, is characterized in that: described time service type satellite receiver contains GPS time service type receiver, Big Dipper generation time service type receiver and Beidou II time service type receiver.
3. multimode split-second precision according to claim 1, frequency standard equipment, it is characterized in that: described pulse per second (PPS) phase correction unit judge pulse per second (PPS) that time service type satellite receiver produces whether can method be: pulse per second (PPS) phase correction unit receives the information based on NMEA agreement from time service type satellite receiver, judge whether time service type satellite receiver has received enough satellite-signals and completed location and timing working by this information, if time service type satellite receiver has completed location and timing working, and be less than 5 for locating with the GDOP of the satellite of timing, then think that pulse per second (PPS) can be used, otherwise think that pulse per second (PPS) is unavailable,
Describedly to the method that fusion treatment is carried out in available pulse per second (PPS) be: first balancing filter process is carried out to the pps pulse per second signal of each time service type satellite receiver, then least-squares algorithm is adopted to carry out adjustment optimization to the pulse per second (PPS) from multiple module, to obtain phase place pps pulse per second signal more accurately.
4. multimode split-second precision according to claim 1, frequency standard equipment, is characterized in that: the different coding in described UTC output encoder module contains IRIG-B serial code and NMEA serial code.
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